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diff --git a/src/pipe_writer.hpp b/src/pipe_writer.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_PIPE_WRITER_HPP_INCLUDED__
+#define __ZS_PIPE_WRITER_HPP_INCLUDED__
+
+#include "object.hpp"
+#include "stdint.hpp"
+
+namespace zs
+{
+
+    class pipe_writer_t : public object_t
+    {
+        //  Dispatcher is a friend so that it can create & destroy the writer.
+        //  By making constructor & destructor private we are sure that nobody
+        //  except dispatcher messes with writers.
+        friend class dispatcher_t;
+
+    public:
+
+        //  Set & get index in the associated demux object.
+        void set_demux (struct i_demux *demux_);
+        void set_index (int index_);
+        int get_index ();
+
+        //  Writes a message to the underlying pipe. Returns false if the
+        //  message cannot be written to the pipe at the moment.
+        bool write (struct zs_msg *msg_);
+
+        //  Flush the messages downsteam.
+        void flush ();
+
+        //  Asks pipe to destroy itself.
+        void terminate ();
+
+    private:
+
+        pipe_writer_t (class object_t *parent_, class pipe_t *pipe_,
+            class object_t *peer_, uint64_t hwm_, uint64_t lwm_);
+        ~pipe_writer_t ();
+
+        void process_head (uint64_t bytes_);
+        void process_terminate ();
+
+        //  The underlying pipe.
+        class pipe_t *pipe;
+
+        //  Pipe reader associated with the other side of the pipe.
+        class object_t *peer;
+
+        //  Associated demux object.
+        struct i_demux *demux;
+
+        //  Index in the associated demux object.
+        int index;
+
+        //  High and low watermarks for in-memory storage (in bytes).
+        uint64_t hwm;
+        uint64_t lwm;
+
+        //  Positions of head and tail of the pipe (in bytes).
+        uint64_t head;
+        uint64_t tail;
+
+        pipe_writer_t (const pipe_writer_t&);
+        void operator = (const pipe_writer_t&);
+    };
+
+}
+
+#endif